Disaster RecoveryNews & Resources

Indoor Ventilation Hazards

Indoor air quality can be heavily influenced by the presence of bioaerosols in the ventilation system. Bioaerosols can be organic dust, virus, bacteria, and microbes. Common culprits include contaminated ventilation components such as clogged drain pans or dripping coils. Maintenance failures, poor filtration and condensation also contribute to airborne contamination.

Bioaerosols like organic dust, viruses, bacteria, and microbes in the ventilation system.

Bioaerosols in HVAC systems can cause negative effects for any occupants in the spaces where the unhealthy air is circulated. In addition to unpleasant odors upper respiratory infections, allergies, and asthma can all be triggered by airborne contaminants.

Conditions for Bioaerosol Activity in Ventilation

Environment- Access to water, either a stagnant source or condensation

Food Source- Pollen, skin particles or dead insects that collect in

Growth- Favorable conditions must remain in place long enough for mold to grow

Dissemination- Aerosolization of spores by passing air

Delivery- A delivery system, usually ductwork, that transmits the spore laden air to occupied areas

What steps should be taken to remove the conditions that optimize mold growth in ventilation systems?

Prevention for Facilities Managers

Schedule regular inspections

Remove standing water from mechanical equipment

Avoid anything that sprays water in HVAC systems

Keep humidity under 70%

Monitor any areas prone to condensation

Use a filter with a Minimum Efficiency Reporting Value(MERV) of at least 12

Keep filtration systems dry

Steps for Individuals

Use exhaust fans where provided and make sure all air flow components are unobstructed

IRS has been selected to provide disaster recovery services to members of the Educational Services Commission of NJ (ESCNJ), the largest co-op in the state service school districts, colleges, universities, housing authorities, and other county and state agencies throughout New Jersey.